Hi - colon cancer normally occurs only at age 40+ although I have read on Medhelp that, very rarely, this disease can be observed in patients as young as ~20. However, in your case the cause is far more likely to be minor. Your line of thinking should be more along the lines of "well I might have colon cancer and I might also get struck by lightening" rather than "Oh my God, I bet that I have got colon cancer". Actually even if you are unfortunate enough to have drawn the infinitessimal "short straw", colon cancer is eminently treatable if discovered early - as it would be in your case - IF>>>!!Nevertheless rectal bleeding is never normal and should always be investigated so you should seek medical advice.
regards
Morecambe
I agree with Morecambie. Although colon cancer is rare in people under 40. It's not unheard of. Your bleeding could be something as minor as a hemorhoid or an anal fissure. I would definatly follow up with your doctor just to be on the safe side. Don't let them dismiss your symptoms just because you are young. Make sure they know without a shadow of doubt it's a hemorrhoid or fissure. If they can't, you may need further testing. However, I would think your symptoms point to a hemorrhoid.